/* GStreamer * Copyright (C) 2008 Nokia Corporation. All rights reserved. * * Contact: Stefan Kost * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_BASE_PARSE_H__ #define __GST_BASE_PARSE_H__ #include #include G_BEGIN_DECLS #define GST_TYPE_BASE_PARSE (gst_base_parse_get_type()) #define GST_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_PARSE,GstBaseParse)) #define GST_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_PARSE,GstBaseParseClass)) #define GST_BASE_PARSE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_PARSE,GstBaseParseClass)) #define GST_IS_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_PARSE)) #define GST_IS_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_PARSE)) #define GST_BASE_PARSE_CAST(obj) ((GstBaseParse *)(obj)) /** * GST_BASE_PARSE_SINK_NAME: * * the name of the templates for the sink pad */ #define GST_BASE_PARSE_SINK_NAME "sink" /** * GST_BASE_PARSE_SRC_NAME: * * the name of the templates for the source pad */ #define GST_BASE_PARSE_SRC_NAME "src" /** * GST_BASE_PARSE_SRC_PAD: * @obj: base parse instance * * Gives the pointer to the source #GstPad object of the element. * * Since: 0.10.x */ #define GST_BASE_PARSE_SRC_PAD(obj) (GST_BASE_PARSE_CAST (obj)->srcpad) /** * GST_BASE_PARSE_SINK_PAD: * @obj: base parse instance * * Gives the pointer to the sink #GstPad object of the element. * * Since: 0.10.x */ #define GST_BASE_PARSE_SINK_PAD(obj) (GST_BASE_PARSE_CAST (obj)->sinkpad) /** * GST_BASE_PARSE_FLOW_DROPPED: * * A #GstFlowReturn that can be returned from parse_frame to * indicate that no output buffer was generated. * * Since: 0.10.x */ #define GST_BASE_PARSE_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS /** * GST_BASE_PARSE_LOCK: * @obj: base parse instance * * Obtain a lock to protect the parse function from concurrent access. * * Since: 0.10.x */ #define GST_BASE_PARSE_LOCK(obj) g_mutex_lock (GST_BASE_PARSE_CAST (obj)->parse_lock) /** * GST_BASE_PARSE_UNLOCK: * @obj: base parse instance * * Release the lock that protects the parse function from concurrent access. * * Since: 0.10.x */ #define GST_BASE_PARSE_UNLOCK(obj) g_mutex_unlock (GST_BASE_PARSE_CAST (obj)->parse_lock) typedef struct _GstBaseParse GstBaseParse; typedef struct _GstBaseParseClass GstBaseParseClass; typedef struct _GstBaseParsePrivate GstBaseParsePrivate; typedef struct _GstBaseParseClassPrivate GstBaseParseClassPrivate; /** * GstBaseParse: * @element: the parent element. * * The opaque #GstBaseParse data structure. */ struct _GstBaseParse { GstElement element; GstAdapter *adapter; /*< protected >*/ /* source and sink pads */ GstPad *sinkpad; GstPad *srcpad; /* MT-protected (with STREAM_LOCK) */ GstSegment segment; /* Newsegment event to be sent after SEEK */ GstEvent *pending_segment; /* Segment event that closes the running segment prior to SEEK */ GstEvent *close_segment; /* Caps nego done already? */ gboolean negotiated; GMutex *parse_lock; /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE]; GstBaseParsePrivate *priv; }; /** * GstBaseParseClass: * @start: Optional. * Called when the element starts processing. * Allows opening external resources. * @stop: Optional. * Called when the element stops processing. * Allows closing external resources. * @set_sink_caps: allows the subclass to be notified of the actual caps set. * @check_valid_frame: Check if the given piece of data contains a valid * frame. * @parse_frame: Parse the already checked frame. Subclass need to * set the buffer timestamp, duration, caps and possibly * other necessary metadata. This is called with srcpad's * STREAM_LOCK held. * @convert: Optional. * Convert between formats. * @find_frame: Optional. * Finds a frame. Gets a position passed and should return * TRUE and the offset in bytes where this position is. * Will only be called in pull mode and the subclass can pull * whatever it wants from upstream. If not implemented, * the base class will implement it by calling * @check_valid_frame and @parse_frame to find the wanted * frame and build a seek table. * @event: Optional. * Event handler on the sink pad. This function should return * TRUE if the event was handled and can be dropped. * @src_event: Optional. * Event handler on the source pad. Should return TRUE * if the event was handled and can be dropped. * @is_seekable: Optional. * Subclass can override this if it wants to control the * seekability of the stream. Otherwise the element assumes * that stream is always seekable. * * Subclasses can override any of the available virtual methods or not, as * needed. At minimum @check_valid_frame and @parse_frame needs to be * overridden. */ struct _GstBaseParseClass { GstElementClass parent_class; /*< public >*/ /* virtual methods for subclasses */ gboolean (*start) (GstBaseParse *parse); gboolean (*stop) (GstBaseParse *parse); gboolean (*set_sink_caps) (GstBaseParse *parse, GstCaps *caps); gboolean (*check_valid_frame) (GstBaseParse *parse, GstBuffer *buffer, guint *framesize, gint *skipsize); GstFlowReturn (*parse_frame) (GstBaseParse *parse, GstBuffer *buffer); gboolean (*convert) (GstBaseParse * parse, GstFormat src_format, gint64 src_value, GstFormat dest_format, gint64 * dest_value); gboolean (*find_frame) (GstBaseParse *parse, GstFormat src_format, gint64 src_value, gint64 * dest_value); gboolean (*event) (GstBaseParse *parse, GstEvent *event); gboolean (*src_event) (GstBaseParse *parse, GstEvent *event); gboolean (*is_seekable) (GstBaseParse *parse); /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE]; GstBaseParseClassPrivate *priv; }; GType gst_base_parse_get_type (void); GstFlowReturn gst_base_parse_push_buffer (GstBaseParse *parse, GstBuffer *buffer); void gst_base_parse_set_duration (GstBaseParse *parse, GstFormat fmt, gint64 duration); void gst_base_parse_set_min_frame_size (GstBaseParse *parse, guint min_size); G_END_DECLS #endif /* __GST_BASE_PARSE_H__ */